Tag: open port 143

The Internet Message Access Protocol (commonly known as IMAP or IMAP4) is an application layer Internet protocol that allows a local client to access e-mail on a remote server. An IMAP protocol is used for e-mail retrieval. Virtually almost all modern e-mail clients and servers support IMAP.

E-mail messages are generally sent to an e-mail server that stores received messages in the recipient’s e-mail mailbox. The user later retrieves these messages with either a web browser or an e-mail client that uses one of a number of e-mail retrieval protocols. While some clients and servers preferentially use vendor specific, typically proprietary protocols, most support the Internet standard protocols SMTP for sending e-mail and POP3 and IMAP4 for retrieving e-mail, allowing interoperability with other servers and clients.